[PATCH] D99795: [gn build] add build file for tsan runtime

[Nico Weber via Phabricator via llvm-commits]

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Linux-only for now. Some mac bits stubbed out, but not tested.

Good enough for the tiny_race.c example at
https://clang.llvm.org/docs/ThreadSanitizer.html :

  $ out/gn/bin/clang -fsanitize=address -g -O1 tiny_race.c
  $ while true; do ./a.out || echo $? ; done

While here, also make `-fsanitize=address` work for .c files.


https://reviews.llvm.org/D99795

Files:
  compiler-rt/lib/tsan/CMakeLists.txt
  llvm/utils/gn/secondary/compiler-rt/lib/BUILD.gn
  llvm/utils/gn/secondary/compiler-rt/lib/asan/BUILD.gn
  llvm/utils/gn/secondary/compiler-rt/lib/tsan/BUILD.gn

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